simplify and fix bugs

Signed-off-by: Mattias Andrée <maandree@operamail.com>

1 files changed, 81 insertions, 0 deletions

diff --git a/src/util.h b/src/util.h
new file mode 100644
index 0000000..fb78e17
--- /dev/null
+++ b/src/util.h
@@ -0,0 +1,81 @@
+/**
+ * MIT/X Consortium License
+ * 
+ * Copyright © 2015  Mattias Andrée <maandree@member.fsf.org>
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+
+#define  t(...)  do { if (__VA_ARGS__) goto fail; } while (0)
+
+
+#define REALLOC(PTR, SIZE)  \
+	do {  \
+		void *new__;  \
+		new__ = realloc(PTR, (SIZE) * sizeof(*(PTR)));  \
+		t (new__ == NULL);  \
+		(PTR) = new__;  \
+	} while (0)
+
+
+#define GROW(PTR, SIZE, DEFAULT)  \
+	do {  \
+		(SIZE) = (SIZE) ? ((SIZE) << 1) : (DEFAULT);  \
+		REALLOC(PTR, SIZE);  \
+	} while (0)
+
+
+#define MAYBE_GROW(PTR, USED, SIZE, DEFAULT)  \
+	do {  \
+		if ((USED) == (SIZE))  \
+			GROW(PTR, SIZE, DEFAULT);  \
+	} while (0)
+
+
+#define GET_VERSION(VER, PATH)  \
+	do {  \
+		(VER) = strrchr((PATH), '=');  \
+		assert((VER) && !strchr((VER), '/'));  \
+	} while (0)
+
+
+#define NEVER_REACHED  \
+	do {  \
+		assert(0);  \
+		abort();  \
+	} while (0)
+
+
+#define RETURN(R)  \
+	for (int errno__ = errno, x__ = 0;; errno = errno__, x__++)  \
+		if (x__) return (R); else
+
+
+#define TEMP_NUL(P, ACTION)  \
+	do {  \
+		char P##__c  = *(P);  \
+		*(P) = '\0';  \
+		ACTION;  \
+		*(P) = P##__c;  \
+	} while (0)
+